Woo Jin takes care of his son Ji Ho alone after his wife Soo A passed away. Before she passed away, she promised she would be back on a rainy day one year later. One year later, Soo A appears again, but she does not remember anything.

Hye-jung works in a factory on the outskirts of the city. All she wants is to live alone in peace. One night, however, she finds she has become a ghost. As a ghost, she goes back in time, day by day, and tries to keep out of harm's way.